lucicfg/genctx.go

// Copyright 2018 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package lucicfg

import (
	"go.starlark.net/starlark"
	"go.starlark.net/starlarkstruct"
)

// genCtx is a starlark struct that represents the state passed to generator
// callbacks (as first and only argument).
type genCtx struct {
	starlarkstruct.Struct

	configSet *configSet
}

func newGenCtx() *genCtx {
	ctx := &genCtx{
		configSet: newConfigSet(),
	}
	ctx.Struct = *starlarkstruct.FromStringDict(starlark.String("gen_ctx"), starlark.StringDict{
		"config_set": ctx.configSet,
	})
	return ctx
}

func init() {
	// new_gen_ctx() makes a new empty generator context object.
	declNative("new_gen_ctx", func(call nativeCall) (starlark.Value, error) {
		if err := call.unpack(0); err != nil {
			return nil, err
		}
		return newGenCtx(), nil
	})
}